<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽">
    </el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree :data="menus" :props="defaultProps" @node-click="handleNodeClick" :expand-on-click-node="false"
             :default-expanded-keys="expandedKey"
             @node-drop="handleDrop"
             :draggable="draggable"
             :allow-drop="allowDrop"
             node-key="catId"
             ref="menuTree"
             show-checkbox>
     <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level<=2"
                     type="text"
                     size="mini"
                     @click="() => append(data)">
            Append
          </el-button>
           <el-button
             type="text"
             size="mini"
             @click="() => edit(data)">
            edit
          </el-button>
          <el-button v-if="node.childNodes.length==0"
                     type="text"
                     size="mini"
                     @click="() => remove(node, data)">
            Delete
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="dialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="submitData">确 定</el-button>
  </span>
    </el-dialog>

  </div>
</template>

<script>
  export default {
    data() {
      return {
        pCid: [],
        draggable: false,
        updateNodes: [],
        maxLevel: 1,
        title: "",
        dialogType: "",//edit.add
        category: {name: "", parentCid: 0, catLevel: 0, showStatus: 1, sort: 0, productUnit: "", icon: "", catId: null},
        menus: [],
        expandedKey: [],
        dialogVisible: false,
        defaultProps: {
          children: 'children',
          label: 'name'
        }
      }
    },
    methods: {
      batchDelete() {
        let catIds = [];
        let checkedNodes = this.$refs.menuTree.getCheckedNodes();
        console.log("被选中的元素:" + checkedNodes);
        for (let i = 0; i < checkedNodes.length; i++) {
          catIds.push(checkedNodes[i].catId);
        }
        this.$confirm(`是否批量删除【${catIds}】菜单?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          this.$http({
            url: this.$http.adornUrl('/product/category/delete'),
            method: 'post',
            data: this.$http.adornData(catIds, false)
          }).then(({data}) => {
            this.$message({
              type: 'success',
              message: '菜单批量删除成功'
            });
            this.getMeuns();
          }).catch(() => {
            this.$message({
              type: 'info',
              message: '已取消删除'
            });
          });
        });
      },
      batchSave() {
        this.$http({
          url: this.$http.adornUrl('/product/category/update/sort'),
          method: 'post',
          data: this.$http.adornData(this.updateNodes, false)
        }).then(({data}) => {
          this.$message({
            type: 'success',
            message: '菜单顺序修改成功'
          });
          this.getMeuns();
          //设置默认展开的菜单
          this.expandedKey = this.pCid;
          this.updateNodes = [];
          this.maxLevel = 0;
          // this.pCid=0;
        });
      }
      ,
      edit(data) {
        console.log("菜单修改" + data);
        this.dialogType = "edit";
        this.title = "修改分类",
          this.dialogVisible = true;
        //发送请求回显当前节点最新数据
        this.$http({
          url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
          method: 'get'
        }).then(({data}) => {
          this.category.name = data.data.name;
          this.category.catId = data.data.catId;
          this.category.icon = data.data.icon;
          this.category.productUnit = data.data.productUnit;
          this.category.parentCid = data.data.parentCid;
        })

      }
      ,
      submitData() {
        if (this.dialogType == "add") {
          this.addCategory();
        }
        if (this.dialogType = "edit") {
          this.editCategory();
        }
      }
      ,
      //修改三级分类
      editCategory() {
        var {name, catId, icon, productUnit} = this.category;
        this.$http({
          url: this.$http.adornUrl('/product/category/update'),
          method: 'post',
          data: this.$http.adornData({name, catId, icon, productUnit}, false)
        }).then(({data}) => {
          this.$message({
            type: 'success',
            message: '菜单修改成功'
          });
          //关闭对话框
          this.dialogVisible = false;
          this.getMeuns();
          //设置默认展开的菜单
          this.expandedKey = [this.category.parentCid];
        });
      }
      ,
      handleDrop(draggingNode, dropNode, dropType, ev) {
        console.log('handleDrop: ', draggingNode, dropNode, dropType);
        //当前节点最新的父节点id
        let pCid = 0;
        let siblings = null;
        if (dropType == "before" || dropType == "after") {
          pCid = dropNode.parent.data.catId == undefined ? 0 : dropNode.parent.data.catId;
          siblings = dropNode.parent.childNodes;
        } else {
          pCid = dropNode.data.catId;
          siblings = dropNode.childNodes;
        }
        this.pCid.push(pCid);
        //当前拖拽节点的最新顺序
        for (let i = 0; i < siblings.length; i++) {
          //如果遍历的是当前正在拖拽的节点
          if (siblings[i].data.catId == draggingNode.data.catId) {
            let catLevel = draggingNode.level;
            if (siblings[i].level != draggingNode.level) {
              //当前节点的层级发生变化
              catLevel = siblings[i].level;
              //修改子节点的层级
              this.updateChildNodeLevel(siblings[i]);
            }
            this.updateNodes.push({catId: siblings[i].data.catId, sort: i, parentCid: pCid, catLevel: catLevel});
          } else {
            this.updateNodes.push({catId: siblings[i].data.catId, sort: i});
          }
        }
        console.log("updateNodes", this.updateNodes);

      }
      ,
      updateChildNodeLevel(node) {
        if (node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            var cNode = node.childNodes[i].data;
            this.updateNodes.push({catId: cNode.catId, catLevel: node.childNodes[i].level});
            this.updateChildNodeLevel(node.childNodes[i]);
          }
        }
      }
      ,
      //添加三级分类
      addCategory() {
        console.log("提交三级分类的数据", this.category);
        this.$http({
          url: this.$http.adornUrl('/product/category/save'),
          method: 'post',
          data: this.$http.adornData(this.category, false)
        }).then(({data}) => {
          this.$message({
            type: 'success',
            message: '菜单保存成功'
          });
          //关闭对话框
          this.dialogVisible = false;
          this.getMeuns();
          //设置默认展开的菜单
          this.expandedKey = [this.category.parentCid];
        });
      }
      ,
      append(data) {
        console.log(data);
        this.dialogType = "add";
        this.title = "添加分类",
          this.dialogVisible = true;
        this.category.parentCid = data.catId;
        this.category.catLevel = data.catLevel * 1 + 1;
        this.category.name = "";
        this.category.catId = null;
        this.category.icon = "";
        this.category.productUnit = "";
        this.category.sort = 0;
        this.category.showStatus = 1;
      }
      ,

      remove(node, data) {
        var ids = [data.catId];
        this.$confirm(`此操作将永久删除【${data.name}】菜单, 是否继续?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          this.$http({
            url: this.$http.adornUrl('/product/category/delete'),
            method: 'post',
            data: this.$http.adornData(ids, false)
          }).then(({data}) => {
            this.$message({
              type: 'success',
              message: '菜单删除成功'
            });
            this.getMeuns();
            //设置默认展开的菜单
            this.expandedKey = [node.parent.data.catId];
          })
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          });
        });

      }
      ,
      allowDrop(draggingNode, dropNode, type) {
        //1.被拖动的当前节点以及所在的父节点总层数不能大于3
        console.log("allowDrop:", draggingNode, dropNode, type);
        this.countNodeLevel(draggingNode);
        //当前正在拖动的节点+父节点所在的深度不大于3即可
        let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;

        if (type == "inner") {
          return (deep + dropNode.level) <= 3;
        } else {
          return (deep + dropNode.parent.level) <= 3;
        }
      }
      ,
      countNodeLevel(node) {
        //找到所有节点，求出最大深度
        if (node.childNodes != null && node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            if (node.childNodes[i].level > this.maxLevel) {
              this.maxLevel = node.childNodes[i].level;
            }
            this.countNodeLevel(node.childNodes[i]);
          }
        }
      }
      ,
      handleNodeClick(data) {
        console.log(data)
      }
      ,
      getMeuns() {
        this.$http({
          url: this.$http.adornUrl('/product/category/list/tree'),
          method: 'get'
        }).then(({data}) => {
          console.log(data.data)
          this.menus = data.data
        })
      }
    },
    created() {
      this.getMeuns();
    }
  }
</script>

<style scoped>

</style>
